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Mediterranean Conference on control and Automation (MED)

作者： Fotis N. Koumboulis Dimitrios G. Fragkoulis Department of Digital Industry Technologies Robotics Automatic Control and Cyber-Physical Systems Laboratory School of Science National & Kapodistrian University of Athens Euboea Greece

ISBN: (数字)9798350395440

ISBN: (纸本)9798350395457

The problem of supervisor design for systems analyzed in cooperating pairs of subsystems is studied. The supervisors realize the cooperation using only sensor and actuator data of each pair of subsystems. The analysis of the system in cooperating pairs of subsystems covers a wide range of applications. Each cooperating ordered pair forms a master/slave relation between the sensor signals of the second element of the pair and the actuator of the first element of the pair. All possible cooperation relations are determined and investigated with respect to the avoidance of blocking and stuck to the initial states of the actuators. The system properties of the cooperation are formulated in a set theoretic scheme that allows the determination of the set of admissible cooperation rules. The present theoretical results are illustrated through one manufacturing application and one infrastructure application.

关键词： Actuators Automation control design Energy exchange Robot sensing systems Main-secondary Manufacturing

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Pulsating Fluidic Sensor for Sensing of Location, Pressure and Contact Area

Pulsating Fluidic Sensor for Sensing of Location, Pressure a...

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IEEE International Conference on robotics and Automation (ICRA)

作者： Joanna Jones Marco Pontin Dana D. Damian Department of Automatic Control and Systems Engineering Sheffield Biomedical Robotics Laboratory University of Sheffield United Kingdom Sheffield Robotics University of Sheffield UK Insigneo Institute for in Silico Medicine University of Sheffield UK

ISBN: (数字)9798350384574

ISBN: (纸本)9798350384581

Designing information-rich and space-efficient sensors is a key challenge for soft robotics, and crucial for the development of safe soft robots. Sensing and understanding the environmental interactions with a minimal footprint is especially important in the medical context, where portability and unhindered patient/user movement is a priority, to move towards personalized and decentralized healthcare solutions. In this work, a pulsating fluidic soft sensor (PFS) capable of determining location, pressure and contact area of press events is shown. The sensor relies on spatio-temporal resistance changes driven by a pulsating conductive fluid. The sensor demonstrates good repeatability and distinction of single and multiple press events, detecting single indents of sizes greater than 1 cm, forces larger than 2 N, and various locations across the sensor, as well as multiple indents spaced 2 cm apart. Furthermore, the sensor is demonstrated in two applications to detect foot placement and grip location. Overall, the sensor represents an improvement towards minimizing electronic hardware, and cost of the sensing solution, without sacrificing the richness of the sensing information in the field of soft fluidic sensors.

关键词： Presses Fluids Soft sensors Medical services Soft robotics Robot sensing systems Hardware

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Vision-based automatic fruit counting with UAV

arXiv

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arXiv 2025年

作者： Szolc, Hubert Wasala, Mateusz Mietla, Remigiusz Iwicki, Kacper Kryjak, Tomasz Embedded Vision Systems Group Computer Vision Laboratory Department of Automatic Control and Robotics AGH University of Krakow al. Mickiewicza 30 Krakow30–059 Poland

The use of unmanned aerial vehicles (UAVs) for smart agriculture is becoming increasingly popular. This is evidenced by recent scientific works, as well as the various competitions organised on this topic. Therefore, in this work we present a system for automatic fruit counting using UAVs. To detect them, our solution uses a vision algorithm that processes streams from an RGB camera and a depth sensor using classical image operations. Our system also allows the planning and execution of flight trajectories, taking into account the minimisation of flight time and distance covered. We tested the proposed solution in simulation and obtained an average score of 87.27/100 points from a total of 500 missions. We also submitted it to the UAV Competition organised as part of the ICUAS 2024 conference, where we achieved an average score of 84.83/100 points, placing 6th in a field of 23 teams and advancing to the finals. © 2025, CC BY.

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Networked PID controller Design for a Heating System

Networked PID Controller Design for a Heating System

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Panhellenic Conference on Electronics and Telecommunications (PACET)

作者： Nikolaos D. Kouvakas Fotis N. Koumboulis Dimitrios G. Fragkoulis Department of Digital Industry Technologies School of Science Robotics Automatic Control and Cyber-Physical Systems Laboratory National and Kapodistrian University of Athens Euboea Euripus Campus Greece

This work studies the issue of remotely controlling a single room’s temperature using a central heating system. The models of the components of the heating system setup are derived by equivalent electric circuits. The combined nonlinear description of the process is used to produce a linear approximant. A Proportional, Integral plus Derivative (PID) controller, located at a considerable distance from the process and receiving measurements and transmitting actuation signals via a wireless network, is designed based on the linear approximant and towards room temperature control. A metaheuristic approach, satisfying stability, approximate model matching, asymptotic command following, and disturbance attenuation, is used to calculate the controller parameters. The suggested scheme’s performance is illustrated through simulations.

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Real-time FPGA implementation of the Semi-Global Matching stereo vision algorithm for a 4K/UHD video stream

TechRxiv

引用

TechRxiv 2023年

作者： Grabowski, Mariusz Kryjak, Tomasz Embedded Vision Systems Group Computer Vision Laboratory Department of Automatic Control and Robotics AGH University of Science and Technology Krakow Poland

In this paper, we propose a real-time FPGA implementation of the Semi-Global Matching (SGM) stereo vision algorithm. The designed module supports a 4K/Ultra HD (3840×2160 pixels @ 30 frames per second) video stream in a 4 pixel per clock (ppc) format and a 64-pixel disparity range. The baseline SGM implementation had to be modified to process pixels in the 4ppc format and meet the timing constrains, however, our version provides results comparable to the original design. The solution has been positively evaluated on the Xilinx VC707 development board with a Virtex-7 FPGA device. © 2023, CC BY.

关键词： Field programmable gate arrays (FPGA)

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Real-time FPGA implementation of the Semi-Global Matching stereo vision algorithm for a 4K/UHD video stream

arXiv

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arXiv 2023年

作者： Grabowski, Mariusz Kryjak, Tomasz Embedded Vision Systems Group Computer Vision Laboratory Department of Automatic Control and Robotics Agh University of Science and Technology Krakow Poland

In this paper, we propose a real-time FPGA implementation of the Semi-Global Matching (SGM) stereo vision algorithm. The designed module supports a 4K/Ultra HD (3840 ×2160 pixels @ 30 frames per second) video stream in a 4 pixel per clock (ppc) format and a 64-pixel disparity range. The baseline SGM implementation had to be modified to process pixels in the 4ppc format and meet the timing constrains, however, our version provides results comparable to the original design. The solution has been positively evaluated on the Xilinx VC707 development board with a Virtex-7 FPGA device. © 2023, CC BY.

关键词： Field programmable gate arrays (FPGA)

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FROST: Fusion and Multimodal 3D Reconstruction of Icy Surfaces for Robotic Exploration

FROST: Fusion and Multimodal 3D Reconstruction of Icy Surfac...

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Computational Intelligence on Engineering/Cyber Physical Systems Companion (CIES Companion), IEEE Symposium on

作者： Huy Xuan Pham Erdal Kayacan Department of Electrical and Computer Engineering Artificial Intelligence in Robotics Laboratory (Air Lab) Aarhus University Aarhus C Denmark Automatic Control Group (RAT) Paderborn University Paderborn Germany

ISBN: (数字)9798331508494

ISBN: (纸本)9798331508500

Three-dimensional (3D) reconstruction serves as a cornerstone in various robotic applications, playing critical roles in scene understanding and navigation. Traditionally, LiDAR has been instrumental in generating precise point clouds of the environment, providing essential data for these applications. However, the efficacy of LiDAR sensors is significantly hindered in challenging conditions, such as the presence of water or icy surfaces. The complex interplay between laser beams and icy or non-ideal surfaces can result in signal degradation, distortion, or even complete signal loss, adversely affecting the accuracy and reliability of the 3D reconstruction process. The reflective and refractive properties of ice, along with its variable surface conditions, present challenges that traditional LiDAR sensors struggle to address. This paper proposes a diverse dataset to facilitate a multimodal approach for reconstructing icy surfaces using various sensors. A preliminary study based on this dataset demonstrates the feasibility of combining the geometric surface obtained from consecutive LiDAR scans with reconstructed meshes from visual cameras. The integration of distinct data sources has the potential to improve the robustness of reconstruction algorithms in diverse scenarios. The dataset can be downloaded at https://***/records/13862009.

关键词： Point cloud compression Surface reconstruction Laser radar Three-dimensional displays Navigation Ice Robustness Laser beams Image reconstruction Surface treatment

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Traffic Sign Detection With Event Cameras and DCNN 25

Traffic Sign Detection With Event Cameras and DCNN

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25th IEEE Signal Processing: Algorithms, Architectures, Arrangements, and Applications, SPA 2022

作者： Wzorek, Piotr Kryjak, Tomasz Embedded Vision Systems Group Agh University of Science and Technology Computer Vision Laboratory Department of Automatic Control and Robotics Kraków Poland Silesian University of Technology Department of Digital Systems Gliwice Poland

ISBN: (数字)9788362065424

ISBN: (纸本)9788362065424

In recent years, event cameras (DVS - Dynamic Vision Sensors) have been used in vision systems as an alternative or supplement to traditional cameras. They are characterised by high dynamic range, high temporal resolution, low latency, and reliable performance in limited lighting conditions - parameters that are particularly important in the context of advanced driver assistance systems (ADAS) and self-driving cars. In this work, we test whether these rather novel sensors can be applied to the popular task of traffic sign detection. To this end, we analyse different representations of the event data: event frame, event frequency, and the exponentially decaying time surface, and apply video frame reconstruction using a deep neural network called FireNet. We use the deep convolutional neural network YOLOv4 as a detector. For particular representations, we obtain a detection accuracy in the range of 86.9-88.9% mAP@0.5. The use of a fusion of the considered representations allows us to obtain a detector with higher accuracy of 89.9% mAP@0.5. In comparison, the detector for the frames reconstructed with FireNet is characterised by an accuracy of 72.67% mAP@0.5. The results obtained illustrate the potential of event cameras in automotive applications, either as standalone sensors or in close cooperation with typical frame-based cameras. © 2022 Division of Signal Processing and Electronic Systems, Poznan University of Technology (DSPES PUT).

关键词： Cameras

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Supervisors for Gas Compressor Stations with Compression and Valve Faults

Supervisors for Gas Compressor Stations with Compression and...

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South Eastern European Design Automation, Computer Engineering, Computer Networks and Social Media Conference (SEEDA-CECNSM)

作者： Dimitrios G. Fragkoulis Fotis N. Koumboulis Nikolas D. Kouvakas Antonis N. Menexis Department of Digital Industry Technologies Robotics Automatic Control and Cyber-Physical Systems Laboratory School of Science National and Kapodistrian University of Athens Greece

A Discrete Event System (DES) based approach is developed for the derivation of the model and safe performance of a gas compressor station (GCS), in the presence of all possible actuator faults. The safe performance goal is surge avoidance, despite the presence of actuator faults, and is modelled as four rules, being translated to four regular languages. The respective supervisor automata are developed to realize the four regular languages. The physical realizability and nonblocking of the synchronous product of the supervisor automata and the automaton of the system is proved. Implementation of the supervisors in the Structured Text language for PLCs is provided.

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Collision Avoidance for Parametric Railway Lines by Supervisor control

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IEEE Access 2025年 13卷 105264-105279页

作者： Fotis N. Koumboulis Dimitrios G. Fragkoulis George E. Panagiotakis Konstantinos A. Ioannou Alexandros Nikolopoulos Department of Digital Industry Technologies Robotics Automatic Control and Cyber-Physical Systems Laboratory School of Science National and Kapodistrian University of Athens Euripus Campus Euboea Greece Core Department National and Kapodistrian University of Athens Euripus Campus Euboea Greece

In the present paper, two collision avoidance supervisor schemes are developed for a single line and one-way railway system, with a parametric number of stations and a parametric number of trains. The consecutive sections of the railway line are linked by Traffic Management Points, being equipped with either motion detectors and/or generalized traffic light indicators, in parametric positions. The parametric model of the railway system is developed. The goal of collision avoidance is translated to three alternative desired behaviors, for three different control schemes. The desired behaviors are formulated in sets of regular languages, being analytic and parametric with respect to the trains and the Traffic Management Points of the railway line. The supervisors realizing each language are designed in simple and transparent forms that can be implemented in different control architectures. The advantages of the supervisors of the second control scheme, regarding the arrival time of the trains, are demonstrated through the application of the supervisors to a developed testbed. The first supervisor scheme covers published results regarding one-way railway lines with two operating trains as a special case. For all control schemes, a reconfigurable supervisor control scheme, towards resilience to new faults and attacks, is designed.

关键词： Rail transportation Collision avoidance control systems Safety Europe Detectors Resilience Rails Logic Analytical models

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